18 months & up. Identify letters, make simple words, and build motor skills with the block-like shapes in the Bark Block Letters set. Includes the 26 letters of the alphabet and 10 others commonly used in words. Made from Poly , these letters are durable enough for both indoor and outdoor play and play with sand, dirt, water, and other messy substances. Includes 36 faux bark pieces. Each letter measures approximately 2"L x 2"W x .5"H.